US 3813870 A
Method for automatic cop doffing in a ring spinner. According to the method, it is provided to grip the reels or cops by pliers carried by a spinner doffing device, adjacent the bottom end thereof to clamp the last coils of wound up yarn; to lift the reels or cops by a distance sufficient to tear the yarn and place a reel again on its associated spindle; then to grip the reels or cops at a higher location than the former, lifting such reels or cops to be unthreaded from the spindles and to complete the doffing operations for replacement with spools.
Description (OCR text may contain errors)
United States Patent 1191 111 3,813,870 [451 June 4, 1974 Viglione  METHOD FOR AUTOMATICALLY 3,350,868 11/1967 Winter 57/52 v DOFFING COPS IN A RING SPINNER 2,952,113 9/1960 Ingham 1 57/52 2.612.744 10/1952 Christianson 57/52 Inventor: Giovanni Viglione, Genova-Sestri,
Italy Assignee: Nuova San Giorgio S. p. A., I
Genova-Sestri, ltaly Filed: Mar. 29, 1973 Appl. M0,: 345,833
Int. Cl D0lh 9/00, DOlh 9/02, DOlh 9/08 Field of Search 57/] R, 34 R, 52, 53, 54,
References Cited UNITED STATES PATENTS 12/1970 Marenco 57 52 Chiari et al. 57/52 Primary Examiner-Donald E. Watkins [5 7] ABSTRACT and to complete the doffing operations for replacev 'ment with spools.
5 Claims/4 Drawing Figures METHOD FOR AUTOMATICALLY DOFFING CO IN A RING SPINNER This invention generally relatesto ring spinners, and more particularly to a method for automatically doffing cops and replacing the cops with new spools.
From a previous patent to the same assignee of this patent application, an automatic spinner is known as provided with a device for automatically doffing cops, the device substantially comprising a movable plierscarrying bar located on one side of the spinner at the spindle-carrying frame, which pliers-carrying bar is provided with a plurality of pliers suitable to grip the cops and spools. Said pliers-carrying bar is movable vertically and horizontally supported between a lower position thereof underlying the spindle-carrying frame and an 'upper position thereof overlying said frame through an articulated framework carried by structure horizontally slidable along suitable guide means, said framework and supporting structure being driven to provide for lifting and lowering the pliers-carrying bar and transversing thereof, as above stated.
In accordance with the apparatusas proposed in the above mentioned patent, and according to'its'operation as provided therein, after forming a thread supply'on each of the spindles prior to stoppage thereof, under the yarn winding spool, and after the ring and yarn guiding loop overturning, thespindle gripping pliers,
would clamp each cop at the top end of the cylindrical '7 portion for'doffing from the spindle and depositing on a corresponding pin of a continuous conveyor underlying the frame and providing for. removing the cops'and supplying the new spools which, when placed on the spindles previously cleared off, would serve to wind up a further cop. However, the method as used with the device according to the previous patent canbe conveniently used where cotton and/or'low stretch yarns are concerned. In case of wool, or synthetic, or long fiber and generally high stretch and tensile stress yarns, upon the yarn break there would occur disadvantages that can be overcome by the doffing method according to the present invention. I I
According to the method as provided for by the apparatus disclosed in the previous patent, each of the pliers would clamp the corresponding cop at atop position such that the last yarn coils wound on the cop periphery between the pliers and the supply formed at a suitable location on the spindle have an undue extension and such that at doffing, where the yarn should be highly resistant and have a high stretch, said coils can wind up, stretch and finally break, leavinga yarn tail of such a length to interfer at the next spinning resumption step with the thread length supplied by the spinner to be wound up on the new spool.
Where highly resistant or high stretch yarns are conply formed on the spindle, so as to provide a minimum yarn stretch, also making it impossible for the coils to unthread from the cop'. In this case, the yarn break at any location in the length between the pliers and supply will always leave a short yarn tail, such as not to interfer with the new thread being supplied at the time of spinning resumption.
Particularly, the method for automatically doffing the cops in such a spinner having a plurality of pliers for gripping the cops and yarn winding spools, said pliers being mounted to a pliers-carrying rod or bar laterally of the spinner and movably vertically and horizontally supported between a bottom position thereof at a conveyor belt for feeding the spools and unloading. the
cerned, this disadvantage may occur on a very high per-.
centage of spindles (spinners having up to 2 Q9 spindles and more are available), so that a loss of time would result for the need of employing special operator teams for joining the broken threads together, which loss of time can often become unacceptable for a regular economical operation of the spinner.
This disadvantage is overcome by the cop doffing method according to the present invention, which method provides to reduce the extension for the coil or coils between the cop clamping pliers and the yarn sup.-
.cops and at least one position at the top of the spindlecarrying frame for said yarn, comprise the steps of moving the pliers in said pliers-carrying bar to a top position thereof; to grip the cops at a location corresponding to or adjacent the lower end of the associated spool;
to close the pliers to grip the cops by firmly pressing the last coil or coils of wound up yarn; to lift the cops by a-distance sufficient to tear the yarn in the length between the cop gripping location anda yarn supply previously wound up on the spindle beneath the spool;and. finally to doff the cops from the spindles, replacing the same with spools for the next spinning resumption.
, Although in the specific embodiment hereinafter disclosed for an apparatus suitable to practice in the present method, the pliers are of a pneumatic character and carried by pairs to separately grip one cop and one spool, respectively, it should be understood that such pneumatic pliers could be as well replaced with pliers of any other type, such-as mechanical pliers, without any change to the novel principle of the present method that canby anyhow practiced. Additionally, in some presently used spinners over the frame the available room is insufficient fordoffing a cop,'gripping it by the pliers at its bottom end. Therefore, an intermediate step is provided where the cop, following the yarn break, is placed again on the spindle, the pliers are carry out the method according to the invention;
FIG. 2 is a schematic fragmentary side view of the spinner shown in FIG. 1; and
FIGS. 3 and 4 are enlarged views showing two subsequent steps in doffing a cop as provided by the method according to the invention.
Referring to FIGS. land 2, a short description will now begiven of the construction of the doffing device suitable to carry out the method according to the invention, as said device is not an essential part of the invention, but replaceable by any other type of devices.
As it will be seen in FIGS. 1 and 2, wherein a spinner 10 has been diagrammatically shown omitting to show those parts of the spinner not essential for fully understanding the invention, it will be seen that said spinner 3 has on two opposing sides spindle-carrying frames 11 cantilever projecting and supporting a plurality of spindles l2 suitably rotatably driven through the belts in a per se well known manner.
For each of the spinner spindle-carrying frames 11 the use is contemplated of a device for cop doffmg, which, as shown, is subsequently formed of an articulated framework comprising a horizontal bar 13 supporting a plurality of pairs of pliers l4, l5 inwardly facing, of which the external pliers 15 are for gripping the yarn cops 16 on the spinner spindles l2, and the internal pliers 14 are for gripping the spools 17 carried by corresponding pins 18 of a continuous conveyor 19 at a bottom position underlying said frame 11. Obviously, said continuous conveyor is controlled to carry the individual' spools 17 to a position in alignment with the gripping pliers.
The pliers-carrying bar 13 is supported for vertically moving between at least one top position at th'e'spindles 12, as shown on the right-hand side of FIG. 1, and a bottom position underlying the frame 11 at said conveyor, as shown on the left-hand side of FIG. 1, by means of an articulated'framework, in addition to said bar 13 comprising, in the embodiment shown in FIG. 1, two side rods pivoted at one end thereof to the plierscarrying-bar l3, andatthe other end thereof to a corresponding block 23 sliding along suitable horizontal guide means carried by a structure 24 horizontally movable from an inner position underlying the spindlecarrying frame to a second position externally of the spinnerby a sufficient distance to avoid any interference of the pliers-carrying bar 13 with said frame 11 or other projecting partsof the spinner, as the latter is upward and downward moved. The two sliding blocks 23 are connected to the two opposing runs of a chain 23' to control the movement thereof in the opposite directions along said guide means. i
This articulated framework supporting structure 24 is driven from horizontal movement on suitable guide means by a rack system 25, diagrammatically shown in PK]. 1, which through a pinion 26 is operated to move by any drive system under the control of a driving shaft for the spinner, or a suitable motor (not shown).
in the exemplary embodiment shown, the pliers 14 and 15 for gripping the spools l7 and cops 16, respectively, are pneumatic pliers comprising inflatable tubular sleeves clamping the spool and cop, respectively, throughout the'dia meter thereof. However, if desired, said pneumatic pliers could be replaced by mechanical pliers or the like, without any change in the principle on which the method according to the present invention is grounded.
The spinner 10 is also provided with members for feeding and guiding a yarn 27,-which is to be wound up on the reels 16, such as loops 28 and guide rings 29 that can be overturned in per se known manner.
The operation will now be described for said doffingdevice, in accordance with the general principles of the present method, by considering an intermediate step contemplating to grip again the cops after thread break for doffin'g in spinners having a reduced free roomin height. However, it is to be understood that for spinners v of other designs this intermediate step could be also omitted.
Prior to stopping and when the reels 16 are fully filled, the spindles will build up at a location underlying the'reel a thread supply 30, as clearly shown in FIGS.
. 4 3 and 4 of the accompanying drawings, by winding up two or more yarn coils. Then, said loops 28 and rings 29 are overturned in per se known manner for starting the dofiing steps.
Then, the doffing device supporting the plierscarrying bar 13 is operated and first through an out-' ward horizontal movement then through an upward vertical movement and an inward horizontal movement carries said bar .13 to a top position where said pliers 15 are overlying and aligned with the reels 16. Then, by a subsequent downward vertical movement of said bar 13, the pliers 15 are carried to a position, shown by solid lines on theright-hand side of FIG. 1 and in FIG. 3, where said pliers 15 are at or adjacent the bottom end of the associated reels l6-or spools.
Once at this position, the pliers will inflate, where pneumatic pliers are concerned, and generally clamp the reels at said bottom position. Hereinafter the description will proceed for the several doffing steps, reference being had to the pneumatic type of pliers, the operation with pliers of other design being apparent.
After the pliers have gripped the reels 16 at the bottom end thereof and at thelast coil or coils of the wound up yarn as clearly shown in FIG. 3, said articulated framework will cause the pliers-carrying bar 13 to partially lift by a distance sufficient to tearthe thread in the length between the clamping location for the pliers on the reel and said yarn supply 30.- s
As clearly shown in FIG. 4, by gripping the reel 16 adjacent its bottom end, a reduction is provided in the free thread lenght along which a break can occur, whereby even though subjected to some stretch as the thread is torn, there is formed at the thread supply 30 a short thread tail 31 (FlG. 4), having the length of a fraction of coil, or at the most one yarn coil. Also the maximum length for said thread tail 31 is such that said tail is left at a free condition without interferring with the thread 27 being supplied by the spinner upon spinning resumption. Should the thread tail 31 be longer, as where each of thepliers 15 would clamp the reel 16 at a top position, said thread tail 31 would entangle or interfer with the thread 27, thereby hindering the winding up thereof on the spool, asshown by dashed lines in FIG. 4'.
By clamping the'reel 16 atits bottom end and at the last coils of would up yarn, in addition to reducing the stretch of the thread tail-31 when breaking, the thread length subjectable to unthreading from the reel or cop is also made very short. Thus, a ready and reliable yarn break is provided during doffing operations.
That the thread tail 31 does not interfer with the yarn 27 upon spinning resumption is also because the ringcarrying carriage will move upwards, prior to winding, by a distance of at least 4-5 cm. from the location where said supply 30 is formed, and this in a well known manner.
After the pliers-carrying bar 13 is lifted for a distance sufficient to cause a thread break, as above stated, the upward movement can be continued to completely unthread the reel 16 from the spindle 12, where a suffi-- cient height space is available in the spinner, then laterally moving and subsequently lowering down again to grip the new spools and place the cops 16 on the pins of the conveyor that have been previously cleared. Otherwise, should enough space be not available above the spindles, the pliers-carrying bar 13, carried by said articulated framework, would lower down again to the position shown in FIG. 3, mounting again the reels l6 bar 13, said pliers are moved to an intermediate or top position to grip the reels at a higher location than the former, as schematically shown by dashed lines on the right-hand side of FIG. 1. The pliers-carrying'bar is then lifted until the bottom of each spool is at a higher level than the associated spindle; the articulated framework assembly is outwardly moved and finally caused to re-enter over the conveyor belt until the axis of each pliers 14 for the spools is coincident with the axis of the spools 17 carried by the corresponding pins 18 of said conveyor. The bar 13 further, moves downward by a short distance until the pliers are at about twothirds of the level of the associatedspools. Thepliers l5 inflategripping the spools and the system repeats the opposite movements to bring the spools over the spindles, threading such spools thereon. During these movements, the pliers l5 always hold the associated cops or reels at a gripped condition. I
Once the pliers have been loosened and have released the spools on the spindles, the pliers are moved away form the spools and the pliers-carrying bar 13 is again moved back to its bottom position underlying the frame 11 to carry the cops on the conveyor belt 19, which is then operated to feed and unload said cops into a proper container at one end of the spinner. At this time, the spinning and winding up operations for the yarn 27 on the spools has already been resumed.
It should be understood that the foregoing, as referred to a doffing apparatus according to the specific embodiment shown inthe accompanying drawings, is not to be intended as a limitationfsince the sequence of the doffing steps could be other than that herein disclosed where allowable by the spinner structure and where the position for the reel or cop pliers and for the spool pliers should be reversed or different from that shown. However, in any case the statement should be unaltered to grip the reels 16 by the associated pliers at the bottom end of the reel, or at the closest location as-possible to the bottom end of the spool in order to reduce the thread length along which a break might occur, thereby reducing the length of the thread"tail remaining attached to the supply normally wound up on the spindle, as previously stated.
What is claimed is: l. A method for automatic cop doffing in a spinner having a plurality of pliers for gripping the reels or cops 6 and the yarn winding up spools, said pliers being carried by a plier-carrying bar, vertically-and horizontally movable supported between one .bottom position thereof adjacent a conveyor belt for feeding the spools and unloading the cops, and at leastone top position relative to thespindle-carrying frame of said spinner,
wherein a provision is made for moving said plierscarrying bar to a top position with said pliers arranged at a closest location as possible to thebottom end of said cops; clamping the pliers by gripping the cops at the bottom end thereof firmly pressing the last coils of wound up yarn; lifting the cops by a distance-sufiicient to tear the thread within the length between the gripping location for one pliers on the cop and a thread supply previously wound up on the spindle underlying the spool; and finally doffing the cop from the spindle and replacing it with a spool.
2; A method for automatic cop doffing in a spinner as claimed in claim 1, whereinfollowing the thread break step, it is further provided to again lower the cop, threading it on the associated spindle, to loosen the pliers grip lifting it by an upward movement of the plierscarr'ying'bar; to grip the cop at a location overlying the former, and then unthread the cop from the spindle for carryingout the subsequent doffing operations, replacing the cops with the spools.
3. A method as claimed in claim 1, wherein use is made of a pneumatic type of pliers.
4. A method as claimed in claim 1, wherein use is made of a mechanical type of pliers.
5. A method as claimed in claim 2, wherein following the yarn break of each cop carried by a pliers of the movable bar, it is provided to lower the pliers-carrying bar to thread again the cops on the associated spindles by gripping the same at an overlying location, further comprising the steps of unthreading the cops from the spindles by a further lifting movement of the plierscarrying bar, outwardly laterally moving it and then lowering it to its bottom position with the pliers for the spools in alignment therewith, clamping said spools carried by said conveyor, and the moving said plierscarrying bar in opposite direction to the first direction down again said pliers-carrying bar still holding the cops to arrange the latter on said conveyor; the cops being then carried, to an end unloading position of the spinner..
UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,813,870 Dated June 4, 1.974
Inventor) Giovanni viglione It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:
Column 6, line 2, change "plier-carrying" to --p1iers-carrying-.
Column 6, line 3, change "movable" to -movably-.
Column 6, line 7, delete "a".
Signed and sealed this 17th day of September 197 (SEAL) Attest:
McCoy M. GIBSON JR. c. MARSHALL DANN Attesting Officer Commissioner of Patents FORM FO-1OSO (10-69) v USCOMM DC 60376 P69 n u.s GOVERNMENT PRINTING OFFICE: I969 o-ass-au